Rubbing and polishing machine.



PATENTED NOV. 10, 1903.

C. SIYARNELL.- RUBBING AND POLISHING MACHINE.

' APPLIOATIUN YILBD Dnc. 29, 1902.

ssHBBTS-SHBBT 1.

Nov MODEL.

\ vgl N/neaoes 3 SHEETS-SHEET 2.

PATENTED NOV. l0, 1903,V

C.. S. YARNELL.

RUBBING AND 'POLISHING MACHINE.

APPLIGATIQN FILED DBG. 29. 1902.

no MODEL.

mi cams PETERS cn., mmou'rno.; wAsNlMGrou, n. c.

W/"n e ad e s PATBNTBD Nov. 10, 190s.

. G. S. YARNBLL, RUBBING AND PGLISHING MACHINE.

UWLICZAHIINV FILED DEU. Z9, 1902.

3 SHEETS-SHEET 3.

N0 MODEL.

No. 743,608. Patented November l0, IOS.

NrTED STATES PATENT CHARLES S. YARNELL, OF MINNEAPOLIS, MINNESOTA,ASSIGNOR TO MOORE CARVING MACHINE COMPANY, F MINNEAPOLIS, MINNESOTA, ACORPO- nATioN oFMINNEsorA.

RUBBlNe AND PoLrlsHlNe MACHINE.

SPECIFICATION forming part of Letters Patent No. 743,608, dated November10, 1903. Application filed December 29, 1902. Serial No. 136,946. (Nomodel.)

To all whom it may concern: p Figs. 11 and 12 are details of the meansfor 5o Be it known that I, CHARLES S. YARNELL, securing thereciprocating heads to the opof Minneapolis, in the county of Hennepin,erating-cable. State of Minnesota, have invented certain In all ot thedrawings, 2 represents the newaud useful Improvementsin Rubbingand frameof the machine,which consists, prefer- Polishing Machines, of which thefollowing is ably, of asuitable base and two upright stand- 55 aspecification. Y ards supporting a horizontal bed-plate carry- Thisinvention relates to rubbing andpoll ing the operating parts of themachine. An ishing machines, and particularly to maadjustable Work-table3 is supported upon l xo chines designed for rubbing and polishingsuitable bearings 4 upon the standards of the surfaces of wood, althoughthe machine is camachine,and this table is adapted to be moved o pablewithout reconstruction of being used horizontally beneath the workingparts of the for polishing surfaces of other materials. machine. It isalso preferably arranged to My present invention is designed particubevertically adjustable by suitable means. I5 larly as an improvement uponthe rubbing (Not shown.) I employa polishing-belt and and polishingmachine 'shown and described one or more reciprocating heads 5, saidheads 65 in Letters Patent No. 685,328, granted Octobeing preferably ofsubstantially the same Y ber 29, 1901, to Henry P. Gale; and theobconstruction as the reciprocating head shown v jects of my presentinvention are, lirst, to and described in the Gale patent, hereinbe- 2oimprove the construction of the Gale mafore referred to. Ido not need,therefore, to chine by providing a supporting-belt and a describe theparticular construction of the 7o polishing-belt with .a belt-tightenerarranged `reciprocating heads. As here shown, these in conjunction withthe polishing-belt,where heads'vare arranged upon a suitable vertiby theslack in the polishing-belt is taken up cally-adj ustable guide-bar 7,by means of z5 and the puckering or wrinkling of that belt which theymay be raised or lowered, so as while in operation is avoided; second,to pron to bring them into or out of contact with the 7 5 vide improvedmeans forreg'ulating the stroke polishing-belt. Any preferredconstruction of the reciprocating heads; third, to provide may be usedfor raising and lowering or means for reversing the travel of thepolishguiding the reciprocating heads. go ing-belt. For applying powerto the machine I pref- To these ends my invention consists generablyarrange a driving-shaft 8, mounted in 8o erally in the constructions andcombinations suitable bearings 9 upon the frame of .the malhereinafterdescribed, and particularly pointchine and provided with a fast pulleyand ed out in the claims. two loose pulleys 11. By means of straight Inthe accompanying drawings, forming and cross belts applied to thesepulleys and part of this specication, Figure l is a front a suitablebeltshifter the shaft 8 may be 85 elevation of my improved machine. Fig.2 driven in either direction. The shaft 8 caris a plan view of the same.Fig. 3 is a detail ries a suitable pulley 12, that supports and sectiontaken lengthwise of the driving-shaft. drives the polishing-belt. Byreversing the 4o Fig. e is an enlarged section showing the driving-shaftand the pulleylf the movement belt-tightener arranged in connection withof the polishing-belt may be reversed at will. 9o the polishing-belt.Fig. 5 is a detailed ele- Arranged loosely upon the shaft 8 are the twovation showing the means for adjusting the loose pulleys 13, and betweenthem is a clutch stroke of the reciprocating head. Fig. 6 is a 11i,provided with a suitable operating-lever horizontal section `on line 6 6of Fig. 5. Fig. 15', and this clutch is adapted to secure either 7 is anenlarged detailed section on line 7 7 of the pulleys 13 tothedriving-shaft 8. Belts 95 of Fig. 5. Fig. 8 is a detail on line 8 8 of15 are arranged upon the pulleys 13, and Fig. 7. Fig. 9 is a detail ouline 9 9 of Fig. these belts extend to a shaft 16, provided with 8. Fig.10 is a section on line 10 lO of Fig. 6. pulleys 17 and 18which areengaged by said belts 15. (See Fig. l.) The pulley 17 is considerablylarger than the pulley 18, so that when the clutch 14 is in engagementwith one of the pulleys 13 the shaft 16 is driven at a greater speedthan when Ithis clutch is in engagement With the other' pulley 13. Theshaft 16 is also provided with a pulley 19, and a belt 20 engages thispulley and extends to a pulley 21 upon a shaft 22. The pulley 21 isloose upon the shaft 22; but it may be connected therewith by means ofasuitable clutch 23, arranged to be operated by a rod 24. The rod 24 maybe operated by any suitable means-such, for instance, as a suitabletreadle. The shaft 22 is provided With a pinion 25, that engages with agear 26 upon a shaft 27, and this shaft is provided With a pinion 28,which engages a gear 30 upon a shaft 29. The gear 30 is provided With acrank-pin 31, to which is connected a rod 32, which extends to acrank-arm 33, arranged upon a rockshaft 34. (See Fig. 7.) The rock-shaft34 is mounted in bearings 35 upon the frame of the machine and carriesat its opposite end a slotted crank-arm 36. A threaded shaft 37 ismounted in bearings in the slotted crankarm 36, this shaft 37 beingprovided with a beveled pinion 38, connected with a similar pinion 39upon a shaft 40, arranged Within the rock-,shaft 34, saidrock-shaftvbeing made hollow to receive the shaft 40. A crank-pin 4l isarranged upon a block 42, and this block is arranged Within the slot inthe crank-arm 36. Arranged within the block 42 is a nut 43, that isengaged by the threaded shaft 37. By turning the shaft 37 the block 42is adjusted lengthwise of the crank-arm 36, and thereby the crank-pin 4lis moved nearer to or farther from the center of the rock-shaft 34, andhence the stroke of said crank-pin is shortened or lengthened. A rod 44is connected to the crank-piu 41 and has its opposite end connected to arocking toothed sector 45, which is in engagement With a pinion 46 upona shaft 47, carrying the large pulley 48. A cable 49 is arranged uponthe beltpulley 48and has its opposite ends secured thereto. This cablepasses over the idler-pulleys 50. The reciprocating heads 5 areconnecte'd to the cable 49, preferably by the hookbolts 49. (See Figs. 4and 12.) By means described power will be applied through the shaft 8and through one of the belt-pulleys 13 and belt 15 to the pulley 21, andwhen this pulley is clutched to the shaft 22 said shaft will be driven.The speed at which the shaft 22 is driven will depend upon which of thebelt-pulleys 13 is connected to the power-shaft 8. From the shaft 22power is applied to the gear 30 upon the shaft 29 and through therock-shaft 34 and crank-arm 36 to the rocking sector 45 and to the shaft47, carrying the pulley 48. It will be noted that by this means theshaft 47 is given an oscillating movement, and by this means through thecable 49 the heads 5 will be reciprocated. As these heads are above thepolishing-belts and as they are arranged to be brought in contact withthe inside of said belt and to press said beltupon its Work, theadjustment of the stroke of the reciprocating heads is veryimportant,owing to the irregular shape of the articles that it isdesired to polish. For operating the adjustable block 42, carrying thecrank-pin 41, I prefer to pro'- vide the shaft with a sprocket-wheel 52,to which is connected a chain 53, that passes around under thesprocket-wheel 53, the shaft of which is provided with a hand-crank 55.The sprocket-chain 53 also preferably passes over an idler sprocket 56.By turning the hand-crank 55 the shaft 40 may be rotatedin eitherdirection, and thereby through the threaded shaft 37 the block 42 may beadjusted toward or from the center of the rockshaft 34, and the movementof the sector 45, and consequently the stroke of the reciprocatingheads, may by this means be quickly adjusted while the machine is inoperation.

In polishing many articles, such as round or oval table-tops, it isnecessary to adjust frequently the stroke of the reciprocating heads,and it is important to do this without stopping the machine. By thismeans the reciprocation of the heads is always under the control of theoperator and may be regulated at Will. In some instances I prefer toemploy two belts, one a supporting-belt 60,the other a sandpaper belt61. The sandpaper belt is arranged outside of and is supported by thebelt 60. I have found that Where these two belts are in close contactthroughout,and particularly When the reciprocating heads are moving inthe opposite direction to the movement of the belts, whatever slackthere may be in the sandpaper belt will cause said belt to wrinkle andpucker between the reciprocating head and the supporting-pulley. This isobjectionable, as it tends to destroy the sandpaper belt. For thispurpose I prefer to make the sandpaper belt 61 longer than thesupporting-belt and to provide a belttightener consisting of a pivotedcrank-arm 62, carrying a pulley 63, that is arranged within the belt 61,the opposite end of the cranklever being engaged by a pivoted threadedrod 64, carrying a hand-wheel 65, and with a spring 66, arranged betweenthe hand-Wheel and lever. By this means an adjustable spring tension isprovided upon the sandpaper belt and any slack in the belt will by thismeans be taken up and the Wrinkling or puckering of the belt Will beentirely avoided.

I have found in polishing wood by means of a polishing-belt that whenthe polishing operation is nearly compelted there will be a slight fuzzoccasioned by adhering fibers, which lie in the direction of themovement of the belt. For the purpose of removing these fibers I have-found it desirable to provide means for reversing the direction oftravel of the polishing-belt and to do this While the reciprocatingpressure-heads are in operation. I accomplish this in my present ICOmachine by providing the driving-shaft with the fast and loose pulleysdescribed and also providing straight and cross belts for operating saiddriving-shaft. By this means when the surface ofthe wood has beensufticiently polished the motion of the polishing-belt may be reversedand the belt can be given a few turns in the opposite direction, therebyremoving any adhering fibers and leaving the surface perfectly clean andsmooth. By securing the reciprocating heads to the cable by means of thehook-bolts 49 I am enabled to quickly release said heads and adj ustthem to any desired position upon the cable. It will also be understoodthat through the clutch-pulley 23 I am enabled to stop the reciprocatingmotion of the heads at any time, so that if it is desired to operate thepolishing-belt while the heads remain stationary this may be done. Itwill also be understood that by means of the two driving-belts 15 andthe clutch 14 I am enabled to reciprocate the heads either at a fast ora slow speed. The

`short belts 15, extending from the pulleys 13 to the pulleys 17 and 18upon the driving-shaft 16, preferably pass over the idler-pulleys 15',which provide means for securing a longer wrap upon the pulleys 17 and18.

I claim as my invention- 1. The combination, in a rubbing and polishingmachine, with a suitable supportingbelt, of apolishing-belt arrangedoutside of said supporting-belt,a belt-tightener arranged between saidbelts and engaging said polishing-belt, and means for reversing at willthe movement of said belts.

2. The combination, in a rubbing and polishing machine, with asupporting-belt, pulleys for supporting and driving said belt, asandpaper belt arranged upon said supporting-belt, a belt-tightenerarranged between said belts and engaging said sandpaper belt, and meansfor pressing the sandpaper belt to its work.

3. The combination, in a rubbing and polishing machine, with a suitablesupportingbelt and means for mounting and driving said belt, of asandpaper belt arranged outside of said supporting-belt, a belt-pulleyarranged between said belts and engaging said sandpaper belt, meansengaging said supportingbelt and thereby pressing the sandpaper belt toits work, and means for reversing at will the movement of said belts.

4. The combination, in a rubbing and polishing machine, with a suitablesupportingbeltand means for mounting and driving said belt, of asandpaper belt arranged outside of said supporting-belt, a belt-pulleyengaging said sandpaper belt, means engaging said supporting-belt andthereby pressing the sandpaper belt toits work, and means for reversingat will the movement of said belts.

5. The combination, in a rubbing and polishing machine, with a rubbingor abrading -means for reversing at will the movement of said belts.

7. The combination, in a rubbing and polishing machine, with apolishing-belt, of a reciprocating head arranged to engage said belt andpress it to its work, suitable mechanism foi-.reciprocating said head,and means for regulating the throw of the head Without stopping themachine, substantially as de-v scribed.

8. The combination,with the polishing-belt, of a reciprocating head,suitable gearing for operating said head, a rock-shaft provided with acrank-arm having a crank-pin and forming a connecting means insaidgearing, and means for adjusting the crank-pin on said crank-arm,substantially as described.

9. The combinatiomwith the polishing-belt, of the reciprocating head,gearing for operating said head, the rock-shaft 34 provided with thecrank-arms 33 and 36 forming a connecting member in said gearing, rods32 and 44 connected to said crank-arms, and means for adjusting thecrank-pin to which one of said rods is connected, substantially asdescribed.n

10. The combination, with the polishingbelt, of the reciprocating head,the rock-shaft 34 provided with the crank-arms 33 and 36, rods 32 and 44connected to said crank-arms, a threaded shaft arranged in one of saidcrank-arms, a shaft passing through the shaft 34 and adapted to operatesaid threaded shaft, an adjustable block arranged upon said threadedshaft and a crank-pin upon said block to which said rod 32 is connected,substantially as described.

In witness whereof I have hereunto set my hand this 26th day ofDecember, 1902.

CHARLES S. YARNELL.

In presence 0f- A. C. PAUL, C. G. HANsoN.

IOO

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